In an endovascular electrolytically detachable wire and tip for the formation of thrombus in arteries, veins, aneurysms, vascular malformations and arteriovenous fistulas
First Claim
1. A method for forming an occlusion within a vascular cavity having blood disposed therein comprising the steps of:
- endovascularly disposing a relaxed coil wire near an endovascular opening into said vascular cavity, said relaxed coil wire having no substantial memory of its predisposed shape other than at most a relaxed, simple helical shape;
disposing a distal tip of said wire into said vascular cavity to substantially space fill said cavity to mechanically form said occlusion within said vascular cavity about said distal tip; and
nonthermally detaching said distal tip from said wire to leave said distal tip within said vascular cavity, wherein nonthermal detachment is defined as a detachment without substantially increasing the temperature of said distal tip and wire,whereby said vascular cavity is occluded by said distal tip, and any thrombus formed by use of said tip.
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Accused Products
Abstract
An artery, vein, aneurysm, vascular malformation or arterial fistula is occluded through endovascular occlusion by the endovascular insertion of a platinum wire and/or tip into the vascular cavity. The vascular cavity is packed with the tip to obstruct blood flow or access of blood in the cavity such that the blood clots in the cavity and an occlusion if formed. The tip may be elongate and flexible so that it packs the cavity by being folded upon itself a multiple number of times, or may pack the cavity by virtue of a filamentary or fuzzy structure of the tip. The tip is then separated from the wire mechanically or by electrolytic separation of the tip from the wire. The wire and the microcatheter are thereafter removed leaving the tip embedded in the thrombus formed within the vascular cavity. Movement of wire in the microcatheter is more easily tracked by providing a radioopaque proximal marker on the microcatheter and a corresponding indicator marker on the wire. Electrothrombosis is facilitate by placing the ground electrode on the distal end of the microcatheter and flowing current between the microcatheter electrode and the tip.
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Citations
24 Claims
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1. A method for forming an occlusion within a vascular cavity having blood disposed therein comprising the steps of:
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endovascularly disposing a relaxed coil wire near an endovascular opening into said vascular cavity, said relaxed coil wire having no substantial memory of its predisposed shape other than at most a relaxed, simple helical shape; disposing a distal tip of said wire into said vascular cavity to substantially space fill said cavity to mechanically form said occlusion within said vascular cavity about said distal tip; and nonthermally detaching said distal tip from said wire to leave said distal tip within said vascular cavity, wherein nonthermal detachment is defined as a detachment without substantially increasing the temperature of said distal tip and wire, whereby said vascular cavity is occluded by said distal tip, and any thrombus formed by use of said tip. - View Dependent Claims (2, 3, 4, 5)
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6. A method for forming an occlusion within a vascular cavity having blood disposed therein comprising the steps of:
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endovascularly disposing a wire within a microcatheter near an endovascular opening into said vascular cavity, said microcatheter having a distal tip electrode; disposing a distal tip of said wire into said vascular cavity to substantially space fill said cavity to form said occlusion within said vascular cavity about said distal tip by applying a current between an electrode on said distal end of said wire disposed into said cavity and said distal tip electrode on said microcatheter; and nonthermally detaching said distal tip from said wire to leave said distal tip within said vascular cavity, wherein nonthermal detachment is defined as a detachment without substantially increasing the temperature of said distal tip and wire, whereby said vascular cavity is occluded by said distal tip, and any thrombus formed by use of said tip.
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7. A wire for use in formation of an occlusion within a vascular cavity used in combination with a microcatheter comprising:
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a core wire having a distal portion; and a detachable elongate tip portion extending said core wire for a predetermined lineal extent and adapted to being packed into said vascular cavity to form said occlusion in said vascular cavity and coupled to said distal portion of said core wire, said elongate tip portion being a relaxed coil having no substantial memory of its predisposed shape other than at most a relaxed, simple helical shape, whereby endovascular occlusion of said vascular cavity can be performed. - View Dependent Claims (8, 9, 10, 11)
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12. A microcatheter system for use in formation of an occlusion within a vascular cavity comprising:
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a microcatheter having a distal end adapted for disposition in the proximity of said vascular cavity, said distal end having an electrode disposed thereon; a conductive wire disposed in said microcatheter and longitudinally displaceable therein, said wire comprising; a core wire having a distal portion; and an elongate tip portion extending said core wire for a predetermined lineal extent and adapted to being packed into said vascular cavity to form said occlusion in said vascular cavity and coupled to said distal portion of said core wire, said occlusion being formed by means of applying a current between said tip portion and said electrode on said microcatheter when said tip portion is disposed into said vascular cavity, said elongate tip portion being a relaxed coil having no substantial memory of its predisposed shape other than at most a relaxed, simple helical shape, whereby endovascular occlusion of said vascular cavity can be performed.
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13. An improvement in a method for forming an occlusion within a vascular cavity having blood disposed therein comprising the step of:
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disposing a body into said vascular cavity without tending to induce any preferred geometric form for said vascular cavity by such disposition, said body being flexible, and shapeless, and having substantially no memory of its predisposed shape other than at most a relaxed, simple helical shape, said body being disposed into said vascular cavity to substantially impede movement of blood in said vascular cavity and to thereby form said occlusion within said vascular cavity, whereby said vascular cavity is occluded by said body. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A wire for use in formation of an occlusion within a vascular cavity used in combination with a microcatheter comprising:
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a core wire having a distal portion; a detachable elongate tip portion extending said core wire for a predetermined lineal extent adapted to being packed into said vascular cavity to form said occlusion in said vascular cavity and coupled to said distal portion of said core wire, said tip portion including a first flexible, shapeless segment having substantially no memory of its predisposition shape other than at most a relaxed, simple helical shape for disposition into said cavity and a second segment for coupling said first portion to said core wire, said second segment being adapted to be electrolysized upon application of current; and an insulating coating disposed on said first segment, said second segment being left exposed to permit selective electrolysis thereof, whereby endovascular occlusion of said vascular cavity can be performed.
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23. A method for forming an occlusion within a vascular cavity having blood disposed therein comprising the steps of:
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endovascularly disposing a wire near an endovascular opening into said vascular cavity; disposing a distal tip of said wire into said vascular cavity to substantially space fill said cavity to form said occlusion within said vascular cavity about said distal tip; forming an electrothrombosis in said vascular cavity by applying current through said distal tip; and mechanically detaching said distal tip from said wire to leave said distal tip within said vascular cavity, whereby said vascular cavity is occluded by said distal tip, and any thrombus formed by use of said tip.
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24. A method for forming an occlusion within a vascular cavity having blood disposed therein comprising the steps of:
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endovascularly disposing a wire within a microcatheter near an endovascular opening into said vascular cavity; disposing a distal tip of said wire into said vascular cavity to substantially space fill said cavity to form said occlusion within said vascular cavity about said distal tip by applying a current to said distal tip packed into said cavity; and mechanically detaching said distal tip from said wire to leave said distal tip within said vascular cavity, whereby said vascular cavity is occluded by said distal tip, and any thrombus formed by use of said tip.
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Specification